TidalMapBig Creek near Alpharetta, GA Water Level Today
NWS river forecast
| When | Stage | Flow |
|---|
Forecast from the NOAA National Water Prediction Service. Issued a few times a day and only while a forecast is active. Not for navigation.
Last 30 days
About this gauge
USGS gauge 02335700 sits on Big Creek and reads everything draining 72 square miles of the Upper Chattahoochee basin. Its datum sits 961 feet above sea level NAVD88. Daily flow has been on record here since 1960, 66 years of it.
Where this gauge sits in the drainage
One gauged site sits upstream of here. The closest is Big Creek at GA 9, near Cumming, GA, reading 37 square miles. This gauge adds the 35 square miles that drain in between. Downstream the next reading comes from Big Creek below Hog Wallow Creek at Roswell, GA at 103 square miles, so what passes this gauge is about 70% of the water measured there. Water passing here goes on to Chattahoochee River below Morgan Falls Dam, GA, Chatt River at Powers Fy and I-285 near Atlanta, GA and Chattahoochee River at US 41, at Atlanta, GA.
Normal flows here
Big Creek runs a median of 66 cfs at this gauge across 66 years of record. March is the fullest month at a median 118 cfs, and September the leanest at 32 cfs. The highest daily mean on record is 4,480 cfs in 1982, and the lowest is 1.7 cfs in 1986.
| Month | Median flow | Share of annual median |
|---|---|---|
| Jan | 100 cfs | 152% |
| Feb | 113 cfs | 171% |
| Mar | 118 cfs | 179% |
| Apr | 103 cfs | 156% |
| May | 76 cfs | 115% |
| Jun | 59 cfs | 89% |
| Jul | 45 cfs | 68% |
| Aug | 39 cfs | 59% |
| Sep | 32 cfs | 48% |
| Oct | 39 cfs | 59% |
| Nov | 53 cfs | 80% |
| Dec | 75 cfs | 114% |
Medians from the USGS daily-statistics record, 1960 to 2026. A month at 100% is running at its own long-term median.
Flood stages and record crests
Big Creek reaches flood stage at this gauge at 7 feet. NWS starts watching it at 6 feet. The highest crest on record is 13.1 feet, in February 1982.
| Category | Gage height |
|---|---|
| Action | 6 ft |
| Minor flooding | 7 ft |
| Moderate flooding | 11 ft |
| Major flooding | 13 ft |
| When | Crest |
|---|---|
| February 1982 | 13.1 ft |
| March 1990 | 12.8 ft |
| February 1961 | 12.5 ft |
| September 2009 | 12.5 ft |
| December 1983 | 12.3 ft |
Flood categories and crest history from the NOAA National Water Prediction Service, gauge APHG1. Stages are gage height, not depth. Not for navigation.
Dams near this gauge
The Army Corps' Morgan Falls Dam is 9 miles from this gauge. The Corps publishes no release schedule for this project; its last observed release and elevations load below.
- Morgan Falls Dam 9 miles
- Buford Dam 14 miles
Nearby river gauges
- Chattahoochee River above Roswell, GA
- Crooked Creek near Norcross, GA
- Chattahoochee River near Norcross, GA
- Big Creek below Hog Wallow Creek at Roswell, GA
- Big Creek at GA 9, near Cumming, GA
- Willeo Creek at GA 120, near Roswell, GA
- Dick Creek at Old Atlanta Rd, near Suwanee, GA
- Chattahoochee River below Morgan Falls Dam, GA
- Beaver Ruin Creek at Mitchell Rd, near Norcross, GA
- N.f Peachtree Creek at Graves Rd, near Doraville,ga
- Chattahoochee River 0.76 Mi US Mcginnis Fy Suwanee GA
- Nancy Creek at Johnson Ferry Rd, at Chamblee, GA
Live streamflow and gage height: USGS gauge 02335700. Percentile context computed against the gauge's period of record. Not for navigation.
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